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fn.py
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fn.py
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# SPDX-License-Identifier: GPL-2.0-or-later
import bpy
import json
import os
import numpy as np
from pathlib import Path
from mathutils import Matrix, Vector, geometry
from bpy_extras import view3d_utils
from math import pi
from .constants import LAYERMAT_PREFIX
def get_addon_prefs():
return bpy.context.preferences.addons[__package__].preferences
## Vector
def location_to_region(worldcoords):
''' return 2d location '''
return view3d_utils.location_3d_to_region_2d(
bpy.context.region, bpy.context.space_data.region_3d, worldcoords)
def region_to_location(viewcoords, depthcoords):
''' return normalized 3d vector '''
return view3d_utils.region_2d_to_location_3d(
bpy.context.region, bpy.context.space_data.region_3d, viewcoords, depthcoords)
def reset_draw_settings(context=None):
## set drawing plane to origin - Front Axis
context = context or bpy.context
settings = context.scene.tool_settings
# 'VIEW', 'AXIS_Y', 'AXIS_X', 'AXIS_Z', 'CURSOR'
settings.gpencil_sculpt.lock_axis = 'AXIS_Y'
# 'ORIGIN', 'CURSOR', 'SURFACE', 'STROKE'
settings.gpencil_stroke_placement_view3d = 'ORIGIN'
def coord_distance_from_view(coord=None, context=None):
context = context or bpy.context
coord = coord or context.scene.cursor.location
rv3d = context.region_data
view_mat = rv3d.view_matrix.inverted()
view_point = view_mat @ Vector((0, 0, -1000))
co = geometry.intersect_line_plane(view_mat.translation, view_point, coord, view_point)
if co is None:
return None
return (co - view_mat.translation).length
def coord_distance_from_cam(coord=None, context=None):
context = context or bpy.context
coord = coord or context.scene.cursor.location
view_mat = context.scene.camera.matrix_world
view_point = view_mat @ Vector((0, 0, -1000))
co = geometry.intersect_line_plane(view_mat.translation, view_point, coord, view_point)
if co is None:
return None
return (co - view_mat.translation).length
def get_cam_frame_world(cam, scene=None):
'''get camera frame center position in 3d space
Need scene to get resolution ratio (default to active scene)
ortho camera note: scale must be 1,1,1 (parent too)
to fit right in cam-frame rectangle
'''
scene = scene or bpy.context.scene
# Without scene passed, base on square
frame = cam.data.view_frame(scene=scene)
mat = cam.matrix_world
frame = [mat @ v for v in frame]
#-# Get center
# import numpy as np
# center = np.add.reduce(frame) / 4
# center = np.sum(frame, axis=0) / 4
return frame
def get_cam_frame_world_center(cam, scene=None):
'''get camera frame center position in 3d space
Need scene to get resolution ratio (default to active scene)
ortho camera note: scale must be 1,1,1 (parent too)
to fit right in cam-frame rectangle
'''
scene = scene or bpy.context.scene
frame = get_cam_frame_world(cam, scene=scene)
#-# Get center
# return np.sum(frame, axis=0) / 4
return np.add.reduce(frame) / 4
def rotate_by_90_degrees(ob, axis='X', negative=True):
angle = pi/2
if negative:
angle += -1
mat_90 = Matrix.Rotation(angle, 4, axis)
ob.matrix_world = ob.matrix_world @ mat_90
def get_scale_matrix(scale):
'''Recreate a neutral mat scale'''
matscale_x = Matrix.Scale(scale[0], 4,(1,0,0))
matscale_y = Matrix.Scale(scale[1], 4,(0,1,0))
matscale_z = Matrix.Scale(scale[2], 4,(0,0,1))
matscale = matscale_x @ matscale_y @ matscale_z
return matscale
def compose_matrix(loc, rot, scale):
loc_mat = Matrix.Translation(loc)
rot_mat = rot.to_matrix().to_4x4()
scale_mat = get_scale_matrix(scale)
return loc_mat @ rot_mat @ scale_mat
def assign_rotation_from_ref_matrix(obj, ref_mat, rot_90=True):
'''Get an object, a reference matrix and assign
:obj: Object to modify
:ref_mat: Matrix to get rotation from
:rot_90: Add and extra 90 degree negative rotation on X axis
Usefull when aligning with camera view so object keep facing front
'''
_ref_loc, ref_rot, _ref_scale = ref_mat.decompose()
if obj.parent:
mat = obj.matrix_world
else:
mat = obj.matrix_basis
o_loc, _o_rot, o_scale = mat.decompose()
loc_mat = Matrix.Translation(o_loc)
if rot_90:
mat_90 = Matrix.Rotation(-pi/2, 4, 'X')
rot_mat = ref_rot.to_matrix().to_4x4() @ mat_90
else:
rot_mat = ref_rot.to_matrix().to_4x4()
scale_mat = get_scale_matrix(o_scale)
new_mat = loc_mat @ rot_mat @ scale_mat
if obj.parent:
obj.matrix_world = new_mat
else:
obj.matrix_basis = new_mat
return new_mat
## GP
def get_gp_draw_plane(context):
''' return tuple with plane coordinate and normal
of the curent drawing according to geometry'''
settings = context.scene.tool_settings
orient = settings.gpencil_sculpt.lock_axis # 'VIEW', 'AXIS_Y', 'AXIS_X', 'AXIS_Z', 'CURSOR'
loc = settings.gpencil_stroke_placement_view3d # 'ORIGIN', 'CURSOR', 'SURFACE', 'STROKE'
mat = context.object.matrix_world if context.object else None
# -> placement
if loc == "CURSOR":
plane_co = context.scene.cursor.location
else: # ORIGIN (also on origin if set to 'SURFACE', 'STROKE')
if not context.object:
plane_co = None
else:
plane_co = context.object.matrix_world.to_translation()# context.object.location
# -> orientation
if orient == 'VIEW':
plane_no = context.space_data.region_3d.view_rotation @ Vector((0,0,1))
## create vector, then rotate by view quaternion
# plane_no = Vector((0,0,1))
# plane_no.rotate(context.space_data.region_3d.view_rotation)
## only depth is important, can return None so region to location use same depth
# plane_no = None
elif orient == 'AXIS_Y': # front (X-Z)
plane_no = Vector((0,1,0))
plane_no.rotate(mat)
elif orient == 'AXIS_X': # side (Y-Z)
plane_no = Vector((1,0,0))
plane_no.rotate(mat)
elif orient == 'AXIS_Z': # top (X-Y)
plane_no = Vector((0,0,1))
plane_no.rotate(mat)
elif orient == 'CURSOR':
plane_no = Vector((0,0,1))
plane_no.rotate(context.scene.cursor.matrix)
return plane_co, plane_no
## -- Palette --
def load_palette(filepath, ob=None):
with open(filepath, 'r') as fd:
mat_dic = json.load(fd)
# from pprint import pprint
# pprint(mat_dic)
if ob is None:
ob = bpy.context.object
for mat_name, attrs in mat_dic.items():
curmat = bpy.data.materials.get(mat_name)
if curmat:
# exists
if curmat.is_grease_pencil:
if curmat not in ob.data.materials[:]: # add only if it's not already there
ob.data.materials.append(curmat)
continue
else:
mat_name = mat_name + '.01' # rename to avoid conflict
## Create a GP mat
mat = bpy.data.materials.new(name=mat_name)
bpy.data.materials.create_gpencil_data(mat)
ob.data.materials.append(mat)
for attr, value in attrs.items():
setattr(mat.grease_pencil, attr, value)
def load_default_palette(ob=None):
'''Return a tuple for '''
ob = ob or bpy.context.object
pfp = Path(__file__).parent / 'palettes'
if not pfp.exists():
return ('ERROR', f'Palette path not found')
base = pfp / 'base.json'
if not base.exists():
return ('ERROR', f'base.json palette not found in {pfp.as_posix()}')
load_palette(base, ob=ob)
return ('FINISHED', f'Loaded base Palette')
def set_material_association(ob, layer, mat_name):
'''Take an object, a gp layer and a material name
Create custom prop for layer material association if possible
'''
if not ob.data.materials.get(mat_name):
print(f'/!\ material "{mat_name}" not found (for association with layer "{layer.info}")')
return
# create custom prop at object level
ob[LAYERMAT_PREFIX + layer.info] = mat_name
## ---
## Brushes
## ---
def create_brush(name, context=None):
context = context or bpy.context
brush = bpy.data.grease_pencil.brushes.new(name)
bpy.data.brushes.create_gpencil_data(brush)
# need to create preview
# how to add to brush list
# how to define brush type
## maybe better to append brush from a provided blend file or targeted brushlib
## (Better for customization)
# context.scene.tool_settings.gpencil_paint.brush = brush
## Animation
def key_object(ob, loc=True, rot=True, scale=True, use_autokey=False, mode=None, options=set(), context=None):
'''Keyframe object location, rotation, scale
:ob: Object to key
:loc: key location
:rot: key rotation
:scale: key scale
:use_autokey: Respect auto_key (if enabled, key only if autokey is activated)
:mode: in None (default), 'AVAILABLE' (add INSERTKEY_AVAILABLE), 'KEYING_SET' (respect keying set, not implemented)
:options: Set in keyframe insert options:
- ``INSERTKEY_NEEDED`` Only insert keyframes where they're needed in the relevant F-Curves.
- ``INSERTKEY_VISUAL`` Insert keyframes based on 'visual transforms'.
- ``INSERTKEY_XYZ_TO_RGB`` Color for newly added transformation F-Curves (Location, Rotation, Scale) is based on the transform axis.
- ``INSERTKEY_REPLACE`` Only replace already existing keyframes.
- ``INSERTKEY_AVAILABLE`` Only insert into already existing F-Curves.
- ``INSERTKEY_CYCLE_AWARE`` Take cyclic extrapolation into account (Cycle-Aware Keying option).
'''
context = context or bpy.context
## Return if not autokeying
if use_autokey and not context.scene.tool_settings.use_keyframe_insert_auto:
return False
if mode == 'AVAILABLE' and not options:
options={'INSERTKEY_AVAILABLE',}
act = None
animation_data = ob.animation_data
if animation_data:
act = animation_data.action
key_loc = False
key_rot = False
key_scale = False
if mode is None:
if loc: key_loc = True
if rot: key_rot = True
if scale: key_scale = True
elif mode == 'AVAILABLE':
if not act:
return
if loc: key_loc = next((fc for fc in act.fcurves if fc.data_path == 'location'), None)
if rot: key_rot = next((fc for fc in act.fcurves if fc.data_path == 'rotation_euler'), None)
if scale: key_scale = next((fc for fc in act.fcurves if fc.data_path == 'scale'), None)
# if not act:
# if loc: key_loc = True
# if rot: key_rot = True
# if scale: key_scale = Truew
text=[]
if key_loc:
ob.keyframe_insert('location', group='Object Transforms', options=options)
text += ['location']
if key_rot:
ob.keyframe_insert('rotation_euler', group='Object Transforms', options=options)
text += ['rotation']
if key_scale:
ob.keyframe_insert('scale', group='Object Transforms', options=options)
text += ['scale']
if text:
return f'{ob.name}: Insert {", ".join(text)} keyframes'
return